const fp = require('lodash/fp')
const { Maybe, Container } = require('./support')

// 1.
let maybe = Maybe.of([5, 6, 1])
let ex1 = functor => functor.map(v => fp.map(fp.add(1), v))
// console.log(ex1(maybe))


// 2.
let xs = Container.of(['do', 'ray', 'me', 'fa', 'so', 'la', 'ti', 'do'])
let ex2 = functor => functor.map(fp.first)._value
// console.log(ex2(xs))


// 3.
let safeProp = fp.curry(function (x, o) {
    return Maybe.of(o[x])
})
let user = { id: 2, name: 'Albert' }
let ex3 = obj => safeProp('name')(obj).map(fp.first)._value
// console.log(ex3(user))


// 4.
let ex4 = n => Maybe.of(n).map(parseInt)._value
// console.log(ex4(1.2))